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I like those rockers a lot and I've been running them for about 5-6 years now. I used to run the hi-tech 1620's but changed to the 1625 Utra Pro Magnums when they came out. They also give a lot more clearance under the valves. Also running them on the MPI's I'm building.

Quote:

Originally Posted by Panther (Post 4425551)

I was on the fence on either the 1620-16 Ultra Pro Mags, Or the 1820-16 Ultra Pro Mag "XD" rocker. the "XD" was almost 100 bucks more a set. The only difference supposedly is the pushrod seat being billet on the "XD", and their rated pressures they can handle. The "XD" is supposedly good for 1100lbs open, and I think 900 lbs open for the non "XD".

It was a tough call being a cheap bastard as I am, but went with the "XD"s anyway.

Good to hear someone else is using them with good results.

Quote:

Originally Posted by getrdunn (Post 4415294)

Just thought I'd post this for all to see. I can't support the authenticity of however take a look.

Since foxwell put up what the EQ heads flowed out of the box on his bench, here's what the AFR 305 and Dart 310s flowed on his bench as well.

Quote:

Eppic disappointment.
I had the chance to do a back-to-back flow comparison comparing factory "advertised" numbers with actual flow numbers from a SF600 with a FlowCom and Audi swirl meter, 4.500 bore fixture, and see just what the truth is.
Heads are a good comparison for competitors:
Dart Pro1 310 as cast, bare, from Dart
AFR 305 as cast, assembled from AFR

Dart 310, valve job from Dart, REV 2.25 intake no backcut, REV 1.88 Inconel ex (tulip style valve), advertised intake @ 28" .800 (all they give you from Dart) 369 cfm.
Truth:
Left/right/ex

.2 140/141/111
.3 207/207/151
.4 271/271/192
.5 322/312/227
.6 351/329/254
.7 365/329/271
.8 341/335/281

The left port is not a mis-print. Very disappointing.

Next: AFR 305 as-cast, assembled from AFR with their valves, 2.25 intake with backcut (angle unknown) AFR 1.88 exhaust.
AFR as-cast advertised:
right/ex

.2 154/131
.3 223/176
.4 287/219
.5 335/251
.6 363/276
.7---------

Truth:
right/left/ex

.2 146/143/109
.3 209/210/144
.4 268/276/185
.5 324/327/223
.6 366/336/250
.7 361/343/262
.8 ---/345/271

The bowls are nicely CNC blended but transition from the seat to the chamber is terrible. The exhaust port I believe suffers far worse because of this than the intake.

So was the afr' left/right int the same?

Quote:

Originally Posted by getrdunn (Post 4425601)

So was the afr' left/right int the same?

No, but almost no big block chevy head is the same on the Left/right ports.

One other small FYI on the EQ heads. My standard spark plug socket does not fit in the recessed area so I could not use a spark plug socket to install the plugs. I had to use a standard socket with a thin wall in order to install them. Just a heads up.

Quote:

Originally Posted by Panther (Post 4426221)

What plugs are you using?

Quote:

Originally Posted by mild thunder (Post 4426222)

what plugs are you using?

ngk r5671a-7

Strange. I just tried two different spark plug sockets, a craftsman and off brand, both fit fine.

Snap-on socket works fine.